EP0229328B1 - Doppelwellen-Zwangsmischer für kontinuierliche und diskontinuierliche Arbeitsweise - Google Patents

Doppelwellen-Zwangsmischer für kontinuierliche und diskontinuierliche Arbeitsweise Download PDF

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Publication number
EP0229328B1
EP0229328B1 EP86117261A EP86117261A EP0229328B1 EP 0229328 B1 EP0229328 B1 EP 0229328B1 EP 86117261 A EP86117261 A EP 86117261A EP 86117261 A EP86117261 A EP 86117261A EP 0229328 B1 EP0229328 B1 EP 0229328B1
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EP
European Patent Office
Prior art keywords
mixing
twin
trough
mixer according
shafts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86117261A
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German (de)
English (en)
French (fr)
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EP0229328A1 (de
Inventor
Rudolf Martinek
Johannes Oertel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BHS Bayerische Berg Hutten und Salzwerke AG
Original Assignee
BHS Bayerische Berg Hutten und Salzwerke AG
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Publication date
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Application filed by BHS Bayerische Berg Hutten und Salzwerke AG filed Critical BHS Bayerische Berg Hutten und Salzwerke AG
Priority to AT86117261T priority Critical patent/ATE66383T1/de
Publication of EP0229328A1 publication Critical patent/EP0229328A1/de
Application granted granted Critical
Publication of EP0229328B1 publication Critical patent/EP0229328B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • B01F27/701—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms comprising two or more shafts, e.g. in consecutive mixing chambers
    • B01F27/702—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms comprising two or more shafts, e.g. in consecutive mixing chambers with intermeshing paddles

Definitions

  • the invention relates to a double-shaft compulsory mixer for mixing powdery, granular and plastic materials, for example for the production of building material mixtures or the like, comprising a mixing trough and in this mixing trough two mutually parallel end walls that are essentially parallel to one another and to the longitudinal axis of the mixing trough of the mixing trough extending, counter-driven, with - in particular a helix coiled - mixing tools equipped mixing shafts with a substantially horizontally aligned axis of rotation, the direction of rotation of the mixing shafts around their axes of rotation is selected so that the mixing tools between the mixing shafts run upwards, and the Mixing tools of the individual mixing shafts are designed and arranged in such a way that they bring about an opposing direction of conveyance along the individual mixing shafts and thus a circulation along a circulation path, and furthermore a comprehensive feed means for introducing granular and possibly liquid mixed material components into the mixing trough and a closable bottom emptying opening arranged in the mixing
  • the continuously operating double-shaft batch mixer is used for larger throughputs - but with limited mixing quality, and the discontinuously operating double-shaft batch mixer for smaller throughputs - but with high mixing quality.
  • the mixing process takes place continuously in the longitudinal direction of the mixing trough on the path between the inlet and outlet openings.
  • the two mixing shafts are driven in opposite directions so that their mixing tools move upwards between the two shafts.
  • the orientation of the mixing tools on both shafts is such that the mixing tools convey on both shafts in the same direction towards the outlet opening. For good and uniform homogeneity of the mix, it is a prerequisite that all mix components are continuously metered to the mixer without errors will.
  • the double-shaft continuous mixer can no longer correct incorrect dosing at a later date because the mixing process between the two mixing units arranged in parallel takes place only in an effective cross-section moving in the direction of transport (see brochure "BHS continuous mixer” P - 2 / 3-83 , Page 2, "Mixing unit” and special print of an article by Dipl.-Ing. (FH) R. Martinek, Sonthofen, "Double-shaft trough mixer in batch and continuous construction", last page).
  • a double-shaft compulsory mixer for processing feed which operates continuously, the intention being to mix solid feed and liquid feed.
  • the two parallel mixing shafts run in opposite directions, in such a way that the mixing tools run downwards between the mixing shafts.
  • the two mixing shafts convey in opposite directions.
  • An outlet with an adjustable cross-section is provided in the bottom of the mixing trough near one end wall between the two mixing shafts.
  • An inlet opening is provided in the area of the other end wall above the mixing shaft which conveys this other end wall. Batch operation is not possible with this device, since batch operation requires a short-term emptying, which is not possible due to the bottom emptying opening intended for continuous operation.
  • a mixing machine for powdery materials is known from DE-C-29 394, in which the mixing shafts with their mixing tools likewise convey in the opposite direction and the addition and removal are continuous are.
  • the directions of rotation of the mixing shafts are selected so that the mixing tools run upwards between the mixing shafts.
  • the mixing process takes place with a circulating mix movement, but with a simultaneous exchange of mix between the two mixers.
  • the two shafts are driven in opposite directions.
  • the orientation of the mixing tools on the two shafts is such that the mixing tools of the one shaft convey in a first direction and the mixing tools of the second shaft in the opposite direction, so that the result is a circular movement of the material to be mixed.
  • This mode of action creates a particularly intensive mixing of all mix components.
  • a work cycle is made up of: loading, mixing and emptying. The mixing process takes place with the floor discharge opening closed and the mixing duration can be selected.
  • the mixing material components are generally added in batches, and emptying takes place within a short emptying time through an appropriately sized bottom emptying opening which extends in the bottom of the mixing trough between the two shafts almost over the entire length of the mixing trough (see, for example, brochure "BHS- Double-shaft compulsory mixer "h-3 / ll-84, pages 2 and 3 and special print of the essay by Martinek (lc), page l).
  • the invention is based on the object, starting from a double-shaft compulsory mixer of the type described, as is known for example from the prospectus "BHS double-shaft compulsory mixer” h-3 / 11-84, to provide a structure which is equally suitable for batch operation and continuous operation can be used.
  • a discharge opening arrangement is provided for continuous mixing operation, which can be switched between an open position for continuous mixing operation and a closing position for batch-wise mixing operation with the bottom discharge opening closed in each case
  • b) that the discharge opening arrangement is in the region of one of the two End walls is that a suitable and suitable for the continuous loading of the mixing trough with granular mixture components is arranged at a location along the circulation path at an axial distance from the end wall in the area of which the discharge opening arrangement is located.
  • the mixing quality in continuous mixing operation can be adjusted particularly favorably by the fact that the feed of the granular mixture components into the mixing trough lies in the region of the mixing shaft which conveys away from the end wall adjacent to the discharge opening arrangement. In this way, an extended path of the continuously conveyed mix is achieved.
  • Optimal mixing ratios for continuous operation in the sense of suppressing the migration of unmixed granular mixture components to the discharge opening arrangement can be achieved if the feed of the feed means of the granular mixture components is at a distance from the end wall which is distant from the discharge opening arrangement, which is approximately 30 to 70% the clear length of the mixing trough in the mixing shaft direction.
  • the discharge opening arrangement can extend approximately between the deepest points of the double trough-shaped bottom of the mixing trough, which means that even liquid residues are reliably removed.
  • the feed means for liquid mixed material components are arranged approximately along the entire batch circulation path within the mixing trough, and that, for continuous operation, the liquid outflow from the feed means can be limited to a partial extent of the batch circulation path along an end wall and along the mixing shafts, in particular on the partial circumference from the point at which the feed means of the granular mix component to a point in front of the discharge opening arrangement.
  • the double-shaft compulsory mixer can also be adapted to the mode of operation with a simple changeover measure with regard to the liquid requirement.
  • the proposed restriction of the liquid supply to part of the batch recirculation path is advantageous because it can prevent unmixed liquid from escaping.
  • the changeover from batch operation to continuous operation becomes particularly easy when the feed means for the liquid mixed material components consist of two separately supplied U-tubes with liquid delivery points distributed over their length, which are arranged above the mixing shafts, with a first one intended for continuous operation U-tube - viewed in plan view - runs approximately along the mixing shaft axes and along the end wall remote from the discharge opening arrangement, and a second U-tube supplements the first U-tube to form an approximately closed loop.
  • the feeding means for the granular mixture components comprise a separate feeding point, in particular an inlet funnel, for batch feeding, namely between the two mixing shafts and preferably in the longitudinal center of the mixing trough between the two end walls.
  • the two mixing units are equipped with a reversing device at the end at which the movement of the batch of material caused by them hits an end wall, which the material to be mixed is deflected along the respective end wall towards the other mixer.
  • a baffle element In order to be able to influence the circulating movement of the batch of material in the mixing trough, it is possible for a baffle element to be arranged in the circulation path of the batch of material in front of the discharge opening arrangement, in a rigid or adjustable manner, for example by pivoting or pulling out.
  • This dam element can be provided with openings of any number, shape and size. This damming element is particularly advantageous for the continuous mode of operation in order to be able to regulate the discharge.
  • the discharge opening arrangement can be designed with a single or double flat slide closure, but also with a single or double flap closure or also with a segment closure.
  • a single or double flap closure is also an alternative to the rotary slide closure in view of the large length.
  • This fill level control can measure the batch size or the fill level by means of a batch size signal transmitter, in particular a fill level probe, and correct deviations from a target size by changing the mix component loading and / or the mix exit.
  • the double-shaft compulsory mixer for continuous and / or discontinuous operation essentially consists of a mixing trough 1 with at least one elongated, rectangular bottom emptying opening 2 arranged at the bottom in the longitudinal direction yy, which can be opened or closed via an emptying closure 9 and over most of the length of the floor.
  • a discharge opening arrangement 3 is arranged transversely to the longitudinal direction y-y in a squat, rectangular shape at the bottom in the mixing trough, near the trough end wall l2 and can also be opened or closed via an emptying closure l0.
  • the two drainage closures 9 and 10 together take up almost the entire length of the bottom.
  • mixers 5 and 6 are provided, the horizontal shafts 4 of which are mounted on both sides outside the trough end walls l2 and l3 in bearings 8 and via a z.
  • one-sided mixer drive 7 driven synchronously in the opposite direction of rotation x will.
  • Both mixers 5 and 6 are paddle mixers which consist of a transport and mixing device, ie of several mixing arms 14 arranged in series with mixing blades 15 and a reversing device, ie of at least one clearing arm 16 with a reversing tool, namely a clearing blade 17, and each on a mixing shaft 4 are fastened, the mixing blades l5 having the same direction, but left-handed spiral, the clearing blades 17 being arranged opposite, that is to say right-handed.
  • each mixing unit in the area of the storage zone A near the trough end walls l2 and l3 is equipped with at least one clearing arm l6, one of which clearing bucket l7 arranged in an oppositely increasing manner, which transports the jammed mix out of the accumulation zone A to the suction zone B and thereby gives the mix a deflection movement component away from the associated end wall l2, l3.
  • This process also substantially supports the circulating mix movement z and keeps it flowing.
  • a so-called storage plate 11, rigid or adjustable, can be swung out or pulled out, which, depending on the requirement, also has openings 18 can be provided in any number, shape and size.
  • the circulating mix movement z can be additionally slowed down as required with the aim of increasing the residence time or throughput time of the mix in the mixing trough.
  • a covering hood 19 is arranged above the mixing trough 1, in which at least two inlet funnels 20 and 21 for the addition of the granular mixture components and two U-shaped pipes 22 and 23 for the addition of the liquid mixture components are arranged.
  • the inlet funnel 20 is attached to a defined feed point above the longitudinal axis of the mixer 6. This ensures that with continuous operation the mixing process between the paddle mixers 5 and 6 takes place over a long transport path, starting at the feed point E and ending at the emptying point F.
  • a second inlet funnel 21 can be arranged in the middle area of the mixing trough between the paddle mixers 5 and 6, in order to be able to add the granular mix components in the middle of the trough with discontinuous operation and difficult to mix mixes with the aim of reducing the mixing time and increasing the mixer throughput.
  • L o is the distance from the center E to the mixing trough front wall 13; L is the inner length of the mixing trough 1 between the end walls 12 and 13.
  • the U-shaped pipelines 22 and 23 are provided with holes or nozzles 24 and with pipe connections 27 laid at any point to the outside, via which the liquid mixture components are supplied.
  • the legs of both U-shaped stirring lines are of different lengths.
  • the charging means 22 for the liquid mixed material components extend to a point L 1 which is approximately 50 to 85%, preferably approximately 75%, of the clear mixed tub length L. from that of the discharge port arrangement 3 distant end wall l3 is removed.
  • the U-shaped pipeline 22 is used in discontinuous operation.
  • any mix e.g. also concrete and mortar or mineral mixtures for hydraulically bound base layers for road construction in continuous or discontinuous mode of operation through the advantage of the circulating mixture movement in direction z with simultaneous mixture exchange between the two mixers 5 and 6 with high mixing quality.
  • both openings 2 and 3 remain closed while the mixing trough 1 is being filled.
  • the filling process is interrupted and the mixture introduced is completed within an adjustable pre-mixing time.
  • the continuous mode of operation is initiated by a regulated, continuous emptying of the material to be mixed with a simultaneous, coordinated continuation of continuous mixer loading.
  • this measure ensures a uniform, homogeneous mix from start to finish without the disadvantageous fluctuations in homogeneity during the filling phase, as is inherent in the known continuous mixing process.
  • the time for the material flow to be switched off after the filling phase can be controlled either via a timing relay, level probe or the load on the drive motor.
  • each continuous mixing process begins with the emptying phase or switching off the mixer feed.
  • the emptying phase takes place when the discharge opening arrangement 3 is open and lasts until the mixing trough is cleared. By additionally opening the bottom emptying opening 2, the complete emptying of the mixing trough can be accelerated.
  • the mixer operates discontinuously, all of the granular and liquid components of the mix are metered in batches, the granular components likewise being able to be added via the inlet funnel 20 or else via the second inlet funnel 2l. However, the liquid mixture components are to be metered simultaneously via the separate pipes 22 and 23. Depending on the requirements in the discontinuous mode of operation, the dust plate 11 can either be partially or completely pivoted out or be pulled out.
  • the mixing process takes place at any desired mixing duration and always with openings 2 and 3 closed.
  • openings 2 and 3 For emptying the mixing trough, it is preferable to use the bottom emptying opening 2, but it is also possible to empty both openings 2 and 3 at the same time in order to accelerate the emptying process .
  • the closure 9 for the bottom emptying opening 2 can be designed as a rotary slide closure or as a single or double flap closure, any opening positions being adjustable.
  • the closure 10 for the discharge opening arrangement 3 can be designed as a single or double flap closure, as a segment closure or also as a single or double flat slide closure, wherein in the double flat slide closure both flat slides can be arranged offset in height from one another.
  • twin-shaft batch mixer can also be used to fall or rise in the longitudinal direction.
  • a start-up batch of granular mixing components is first entered through the funnels 20 and / or 2l.
  • the corresponding amount of liquid mix components is supplied through the U-tubes 22 and / or 23.
  • the two openings 2 and 3 are closed.
  • mixing is first carried out without removal, the mixing occurring especially in the area between the two shafts 4, where the mixing blades going upward cause turbulence to promote the mixing process.
  • the start-up phase ends.
  • Granular mixture components are now continuously fed through the feed hopper 20, possibly premixed or in parallel flows.
  • the discharge opening arrangement 3 is opened, to the extent that a quantity of mixed material is drawn off per time unit which corresponds to the mixed material components supplied per unit time.
  • liquid mixture components are continuously supplied through the U-tube 22.
  • the granular mix components can comprise fine powdery components up to coarse-grained components.
  • the mutual coordination of the supply of mixed material components through the hopper 20 and the tapping of mixed material through the discharge opening arrangement 3 is carried out by a control system, not shown, which ensures that the batch of mixed material stationary in the mixing trough remains constant. If there is temporarily no need for mixed material, the supply of mixed material components and the drawing off of mixed material can be temporarily stopped without the mixing units 5 and 6 being switched off.
  • the position of the inlet funnel 20 ensures that there is a relatively long way for the mixed material components added through the inlet funnel 20 to reach the discharge opening arrangement 3 in continuous operation.
  • the inlet funnel 20 should not be approached up to the immediate vicinity of the end wall l2, since in this case the cross-conveying action of the mixing blades l5 could lead to unmixed mixture components getting into the area of the mixer 5 and through its mixing blades on a too short remaining path to the Discharge opening arrangement 3 are transported.
  • the system If the system is to be shut down, it can be emptied gradually through the discharge opening arrangement 3 after the supply of the mixed material components has been switched off, or very much faster through the additional opening of the bottom emptying opening 2.
  • the mix components are preferably fed through the hopper 2l, which can be dimensioned so large that it can be loaded, for example, by means of a gripper. Basically, however, feeding through the inlet funnel 20 is also possible for discontinuous operation. Mixing takes place with openings 2 and 3 closed until the desired homogenization is achieved. The entire batch is then removed through the bottom emptying opening 2 and, if appropriate, additionally through the discharge opening arrangement 3.
  • the liquid mixed material components are preferably supplied only at the beginning of the same approximately simultaneously or immediately after the introduction of the granular mixed material component, namely by both U. -Tubes 22 and 23.
  • a particular advantage of the invention lies in the fact that one and the same system can be used both continuously and batchwise. Continuous work is carried out, for example, when mix material is continuously requested, for example on large trucks with a flying loading change, concrete pumps, etc. By appropriately coordinating the continuous supply of mix material and the continuous supply of mix material to the size of the stationary batch circulated in the mixing trough for a more or less qualitative high-quality mix. On the one hand, you can work with a high output, for example when you need a lean concrete for road substructures, the quality of which is not subject to any special requirements, and on the other hand, you can also obtain a high-quality mix in continuous operation with a correspondingly lower throughput.
  • the discontinuous mode of operation will generally be used for the production of mixed material of the highest quality and, on the other hand, when the mixed material is required in batches, in large quantities per unit of time.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Direct Current Motors (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
EP86117261A 1985-12-11 1986-12-11 Doppelwellen-Zwangsmischer für kontinuierliche und diskontinuierliche Arbeitsweise Expired - Lifetime EP0229328B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86117261T ATE66383T1 (de) 1985-12-11 1986-12-11 Doppelwellen-zwangsmischer fuer kontinuierliche und diskontinuierliche arbeitsweise.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3543745 1985-12-11
DE19853543745 DE3543745A1 (de) 1985-12-11 1985-12-11 Doppelwellen-zwangsmischer fuer kontinuierliche und diskontinuierliche arbeitsweise

Publications (2)

Publication Number Publication Date
EP0229328A1 EP0229328A1 (de) 1987-07-22
EP0229328B1 true EP0229328B1 (de) 1991-08-21

Family

ID=6288174

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Application Number Title Priority Date Filing Date
EP86117261A Expired - Lifetime EP0229328B1 (de) 1985-12-11 1986-12-11 Doppelwellen-Zwangsmischer für kontinuierliche und diskontinuierliche Arbeitsweise

Country Status (6)

Country Link
US (1) US4775239A (es)
EP (1) EP0229328B1 (es)
JP (1) JPS62140633A (es)
AT (1) ATE66383T1 (es)
DE (2) DE3543745A1 (es)
ES (1) ES2025554T3 (es)

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Also Published As

Publication number Publication date
EP0229328A1 (de) 1987-07-22
DE3543745A1 (de) 1987-06-19
US4775239A (en) 1988-10-04
DE3681006D1 (de) 1991-09-26
ATE66383T1 (de) 1991-09-15
JPH048096B2 (es) 1992-02-14
JPS62140633A (ja) 1987-06-24
ES2025554T3 (es) 1992-04-01

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